text: // safer.h - written and placed in the public domain by Wei Dai
  
  //! \file safer.h
  //! \brief Classes for the SAFER block cipher
  
  #ifndef CRYPTOPP_SAFER_H
  #define CRYPTOPP_SAFER_H
  
  #include "seckey.h"
  #include "secblock.h"
  
  NAMESPACE_BEGIN(CryptoPP)
  
  /// base class, do not use directly
  class SAFER
  {
  public:
  	class CRYPTOPP_NO_VTABLE Base : public BlockCipher
  	{
  	public:
  		unsigned int OptimalDataAlignment() const {return 1;}
  		void UncheckedSetKey(const byte *userkey, unsigned int length, const NameValuePairs &params);
  
  	protected:
  		virtual bool Strengthened() const =0;
  
  		SecByteBlock keySchedule;
  		static const byte exp_tab[256];
  		static const byte log_tab[256];
  	};
  
  	class CRYPTOPP_NO_VTABLE Enc : public Base
  	{
  	public:
  		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
  	};
  
  	class CRYPTOPP_NO_VTABLE Dec : public Base
  	{
  	public:
  		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
  	};
  };
  
  template <class BASE, class INFO, bool STR>
  class CRYPTOPP_NO_VTABLE SAFER_Impl : public BlockCipherImpl<INFO, BASE>
  {
  protected:
  	bool Strengthened() const {return STR;}
  };
  
  //! _
  struct SAFER_K_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
  {
  	static const char *StaticAlgorithmName() {return "SAFER-K";}
  };
  
  /// <a href="http://www.weidai.com/scan-mirror/cs.html#SAFER-K">SAFER-K</a>
  class SAFER_K : public SAFER_K_Info, public SAFER, public BlockCipherDocumentation
  {
  public:
  	typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_K_Info, false> > Encryption;
  	typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_K_Info, false> > Decryption;
  };
  
  //! _
  struct SAFER_SK_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
  {
  	static const char *StaticAlgorithmName() {return "SAFER-SK";}
  };
  
  /// <a href="http://www.weidai.com/scan-mirror/cs.html#SAFER-SK">SAFER-SK</a>
  class SAFER_SK : public SAFER_SK_Info, public SAFER, public BlockCipherDocumentation
  {
  public:
  	typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_SK_Info, true> > Encryption;
  	typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_SK_Info, true> > Decryption;
  };
  
  typedef SAFER_K::Encryption SAFER_K_Encryption;
  typedef SAFER_K::Decryption SAFER_K_Decryption;
  
  typedef SAFER_SK::Encryption SAFER_SK_Encryption;
  typedef SAFER_SK::Decryption SAFER_SK_Decryption;
  
  NAMESPACE_END
  
  #endif
  